AdWords - Google's pay per click advertising system

AdWords - Google's pay per click advertising system. Ads can be placed as sponsored ads on a Google search engine results page (and on any site that is part of Google's 'content network' as part of their AdSense service). Recognizing how complex their ad systems have become, in April 2006 Google introduced its AdWords Editor, a free downloadable account-management tool. Such is the popularity of Google that AdWords is often used as the generic term for the practice, even though the other major search engines have their own versions - Yahool search marketing and MSN adCenter.